Craig Mayer, Nick WIlliams, Vojtech Huser
Lister Hill National Center for Biomedical Communications, National Library of Medicine, NIH, Bethesda, MD

See the full regCTG repository at https://github.com/lhncbc/CRI/tree/master/regCTG

To return to the list of conditions and view other reports go to https://lhncbc.github.io/CRI/regCTG/regCTG-condition_report_links.html


Study Counts

Type Study_count
Total_Studies 1302
interventional 1145
Observational 141
Registry 16

Studies over Time

```

Interventional Trials

Intervention Type

intervention_type Study_Count
Drug 591
Biological 109
Biological|Drug 79
Drug|Other 51
Biological|Drug|Other 47
Drug|Procedure 29
Biological|Drug|Procedure|Radiation 22
Biological|Drug|Other|Procedure|Radiation 17
Drug|Radiation 17
Drug|Procedure|Radiation 16
Biological|Other 13
Drug|Other|Procedure|Radiation 13
Drug|placebo 12
Other 12
Procedure 12
Behavioral 11
Biological|Drug|Other|Procedure 8
Biological|Drug|Radiation 7
Drug|Genetic 7
Dietary Supplement 6
Drug|Other|Radiation 6
Biological|Drug|Procedure 5
Combination Product 5
Device 5
Drug|Genetic|Other 3
Drug|Other|Procedure 3
Biological|Device|Drug 2
Biological|Drug|Genetic|Other|Procedure 2
Biological|Procedure 2
Device|Other 2
Dietary Supplement|Other 2
Dietary Supplement|placebo 2
Other|Procedure 2
Behavioral|Drug|Other|Procedure 1
Biological|Device 1
Biological|Device|Drug|Other|Procedure 1
Biological|Device|Drug|Procedure|Radiation 1
Biological|Device|Drug|Radiation 1
Biological|Drug|Genetic|Other 1
Biological|Drug|Other|Radiation 1
Biological|Genetic|Other 1
Biological|Genetic|Other|Procedure 1
Biological|Other|Procedure 1
Biological|placebo 1
Device|Drug 1
Device|Drug|Other 1
Device|Drug|Other|Procedure|Radiation 1
Device|Drug|Procedure 1
Device|Drug|Procedure|Radiation 1
Diagnostic Test|Drug 1
Diagnostic Test|Drug|Genetic|Procedure|Radiation 1
Dietary Supplement|Drug 1
Dietary Supplement|Drug|Other 1
Drug|Genetic|Procedure|Radiation 1
Drug|Other|placebo|Procedure 1
Drug|placebo|Procedure 1
Genetic 1
Genetic|Other 1

Count of Studies by Intervention (normalized and mapped)

Interventions over Time

Weekly studies for each intervention

Studies by Country

Country Study_Count
United States 627
China 52
Germany 36
France 26
Italy 23
Spain 21
NA 20
Japan 18
United States|Canada 17
United Kingdom 16
Canada 11
Korea, Republic of 10
United States|Australia|Canada 8
Austria 7
United States|Australia 7
Denmark 5
Mexico 5
Sweden 4
United States|Australia|Canada|Puerto Rico 4
United States|Germany|Italy 4
United States|Italy 4
Austria|Germany 3
Denmark|Finland|Iceland|Norway|Sweden 3
Israel 3
Russian Federation 3
Turkey 3
United States|Australia|Canada|Netherlands|Puerto Rico|Switzerland 3
United States|Australia|Canada|New Zealand|Puerto Rico 3
United States|Australia|Canada|New Zealand|Switzerland 3
United States|France|Germany|Italy|United Kingdom 3
United States|Germany 3
United States|United Kingdom 3
Austria|France|Germany 2
Germany|Austria 2
Hong Kong 2
Lithuania 2
Spain|United States|Argentina|Australia|Austria|Brazil|Bulgaria|Canada|Croatia|Czechia|Denmark|Egypt|Estonia|France|Germany|Hong Kong|Italy|Mexico|Netherlands|New Zealand|Romania|Russian Federation|Slovakia|Switzerland|Thailand|United Kingdom 2
Switzerland 2
United States|Australia|Austria|Belgium|France|Germany|Hungary|Italy|New Zealand|Spain|United Kingdom 2
United States|Australia|Belgium|Canada|China|Czechia|Ireland|Israel|Italy|New Zealand|Poland|Russian Federation|Spain|Turkey|Ukraine|United Kingdom 2
United States|Australia|Canada|Ireland|New Zealand|Puerto Rico|Switzerland 2
United States|Australia|Canada|New Zealand 2
United States|Australia|France|Poland 2
United States|Canada|France|Netherlands 2
United States|Canada|Puerto Rico 2
United States|Denmark|Germany 2
United States|France|Germany 2
United States|Puerto Rico|South Africa 2
Argentina|Australia|Austria|Belarus|Belgium|Canada|Chile|Croatia|Czechia|Denmark|Finland|France|Germany|Greece|Hungary|Israel|Italy|Malaysia|Mexico|Netherlands|New Zealand|Norway|Poland|Romania|Saudi Arabia|Slovakia|Slovenia|Spain|Sweden|Switzerland|Turkey 1
Argentina|Australia|Brazil|Canada|Chile|Croatia|Czechia|France|Germany|Greece|Italy|Mexico|New Zealand|Poland|Portugal|Russian Federation|Slovakia|Spain|Turkey 1
Argentina|Australia|Bulgaria|Hong Kong|Hungary|Mexico|New Zealand|Poland|Russian Federation|Taiwan 1
Argentina|Austria|Belgium|Chile|Czech Republic|Germany|Hungary|Italy 1
Argentina|Belgium|Bosnia and Herzegovina|Brazil|Canada|Egypt|Estonia|Finland|France|Germany|Greece|Ireland|Israel|Italy|Korea, Republic of|Latvia|Lithuania|Mexico|North Macedonia|Poland|Portugal|Romania|Russian Federation|Serbia|Slovakia|Slovenia|Spain|Sweden|Switzerland|Thailand|Turkey 1
Argentina|Belgium|Canada|Denmark|Finland|France|Italy|Netherlands|Norway|Sweden 1
Argentina|Croatia|Greece|Ireland|Italy|New Zealand|Russian Federation|United Kingdom 1
Argentina|Venezuela 1
Armenia|Belarus|Kyrgyzstan|Russian Federation|Uzbekistan 1
Australia|Austria|Belgium|Czech Republic|Denmark|France|Germany|Israel|Italy|New Zealand|Spain 1
Australia|Austria|Czechia|Germany|Israel|Italy|Slovakia|Switzerland 1
Australia|Austria|Czechia|Germany|Israel|Italy|Switzerland 1
Australia|Belgium|France|Germany|Italy|Korea, Republic of|Netherlands|Singapore|Spain|Sweden|United Kingdom 1
Australia|China|New Zealand|Taiwan 1
Australia|France|Germany|Hungary|Korea, Republic of|Poland|Singapore|United Kingdom 1
Australia|United Kingdom 1
Austria|Belgium|Bulgaria|Czechia|France|Germany|Hungary|Ireland|Israel|Italy|Poland|Russian Federation|Singapore|Slovakia|Sweden|Ukraine|United Kingdom 1
Austria|Belgium|Canada|France|Germany|Italy|Japan|Norway|Spain 1
Austria|Belgium|France|Germany|Italy|Netherlands|Poland|Romania|Russian Federation|Spain|United Kingdom 1
Austria|Belgium|France|Italy 1
Austria|Brazil|United States|Argentina|Australia|Bulgaria|Canada|Croatia|Czechia|Denmark|Egypt|Estonia|France|Germany|Hong Kong|Italy|Mexico|Netherlands|New Zealand|Romania|Russian Federation|Slovakia|Spain|Switzerland|Thailand|United Kingdom 1
Austria|Czechia|Slovakia 1
Austria|Finland|Germany|Russian Federation 1
Austria|France|Germany|Italy|Netherlands|United Kingdom 1
Austria|Germany|Switzerland 1
Bangladesh 1
Belarus|Poland 1
Belarus|Russian Federation|Uzbekistan 1
Belgium 1
Belgium|Croatia|Czech Republic|France|Germany|Italy|Netherlands|Portugal|Slovakia|Turkey 1
Belgium|Denmark|Estonia|Finland|Germany|Iceland|Ireland|Lithuania|Netherlands|Norway|Portugal|Sweden|United Kingdom 1
Belgium|Denmark|Netherlands 1
Belgium|France 1
Belgium|France|Germany 1
Belgium|France|Germany|Italy 1
Belgium|France|United States|Israel|Spain|United Kingdom 1
Belgium|Netherlands 1
Brazil 1
Bulgaria|Georgia|Poland 1
Canada|France 1
Canada|Germany 1
Canada|Russian Federation|Spain 1
Canada|United States|Australia|New Zealand|Switzerland 1
China|Malaysia|Australia|Taiwan 1
China|Philippines|Taiwan|Thailand|Vietnam 1
Czech Republic 1
Denmark|Estonia|Finland|Lithuania|Norway|Sweden 1
Denmark|Sweden 1
Egypt 1
France|Germany|Spain 1
France|United Kingdom 1
Germany|Austria|Belgium|Denmark|Finland|Ireland|Israel|Netherlands|Sweden|Switzerland 1
Germany|Netherlands 1
Germany|Netherlands|United Kingdom 1
Germany|United States|Australia|Austria|Belgium|Canada|Denmark|Finland|France|Hong Kong|Italy|Korea, Republic of|Netherlands|New Zealand|Norway|Poland|Singapore|Spain|Sweden|Switzerland|Taiwan|United Kingdom 1
Greece 1
Hong Kong|Japan|Malaysia|Singapore|Taiwan 1
India 1
Iran, Islamic Republic of 1
Japan|Korea, Republic of 1
Malaysia 1
Netherlands 1
Netherlands|United Kingdom 1
Poland|Spain 1
Poland|United Kingdom 1
Spain|Finland|France|Portugal|Sweden|Tunisia|Turkey|United Kingdom 1
Spain|United States|Australia|Austria|Belgium|Canada|Colombia|Czechia|Denmark|France|Germany|Hungary|Ireland|Israel|Italy|Mexico|Netherlands|New Zealand|Poland|Portugal|Romania|Russian Federation|South Africa|Sweden|United Kingdom 1
Spain|United States|Australia|Belgium|Denmark|France|Germany|Hungary|Israel|Italy|Netherlands|New Zealand|Poland|Turkey|United Kingdom 1
United States|Argentina|Australia|Austria|Belarus|Brazil|Bulgaria|Canada|Finland|France|Greece|Italy|Korea, Republic of|Poland|Russian Federation|Spain|Taiwan|Turkey 1
United States|Argentina|Australia|Austria|Belgium|Brazil|Canada|Denmark|Finland|France|Germany|Israel|Italy|Korea, Republic of|Netherlands|Norway|Peru|Sweden|Switzerland|United Kingdom 1
United States|Argentina|Australia|Austria|Brazil|Bulgaria|Canada|Croatia|Denmark|Estonia|France|Germany|Italy|Mexico|New Zealand|Poland|Romania|Russian Federation|Spain|Switzerland|United Kingdom 1
United States|Argentina|Australia|Austria|Brazil|Bulgaria|Canada|Czechia|Denmark|France|Germany|Hungary|Israel|Italy|Korea, Republic of|Netherlands|Poland|Russian Federation|Saudi Arabia|Slovakia|South Africa|Spain|Sweden|Taiwan|Turkey|United Kingdom 1
United States|Argentina|Australia|Belgium|Brazil|Canada|China|Colombia|Czechia|France|Germany|Greece|Hungary|Ireland|Israel|Italy|Korea, Republic of|Mexico|Netherlands|Poland|Portugal|Russian Federation|Spain|Sweden|Taiwan|Turkey|Ukraine|United Kingdom 1
United States|Argentina|Australia|Brazil|Canada 1
United States|Argentina|Australia|Canada|China|Czechia|Finland|France|Germany|Hungary|Italy|Japan|Korea, Republic of|Netherlands|Poland|Singapore|Spain|Sweden|Taiwan|United Kingdom 1
United States|Argentina|Belgium|Brazil|Canada|Colombia|Czechia|France|Germany|Greece|Israel|Korea, Republic of|Mexico|Poland|Portugal|Russian Federation|Spain|Sweden|Turkey|Ukraine|United Kingdom 1
United States|Australia|Austria|Belgium|Brazil|Bulgaria|Canada|Chile|Colombia|Croatia|Czechia|Denmark|France|Hungary|Israel|Italy|Netherlands|New Zealand|Poland|Portugal|Romania|Russian Federation|Serbia|Slovakia|South Africa|Spain|United Kingdom 1
United States|Australia|Austria|Belgium|Bulgaria|Canada|Croatia|Czechia|France|Germany|Hong Kong|Hungary|Israel|Italy|Korea, Republic of|New Zealand|Poland|Russian Federation|Singapore|Slovakia|Spain|Sweden|Taiwan|Ukraine|United Kingdom 1
United States|Australia|Austria|Belgium|Canada|Czechia|Denmark|France|Germany|Hungary|Italy|Korea, Republic of|Netherlands|New Zealand|Poland|Russian Federation|Spain|Sweden|Taiwan|United Kingdom 1
United States|Australia|Austria|Belgium|Canada|Czechia|France|Israel|Italy|New Zealand|Poland|Russian Federation|Spain|Sweden|Turkey|United Kingdom 1
United States|Australia|Austria|Belgium|Canada|France|Germany|Italy|Japan|Norway|Spain 1
United States|Australia|Austria|Belgium|Czechia|France|Italy|New Zealand|Poland|Russian Federation|Spain|Sweden|Taiwan|United Kingdom 1
United States|Australia|Austria|Belgium|France|Ireland|Italy|Poland|Spain|United Kingdom 1
United States|Australia|Austria|Canada|Denmark|France|Israel|Italy|Netherlands|Spain|Switzerland|United Kingdom 1
United States|Australia|Belgium|Brazil|Canada|Czechia|Korea, Republic of|Mexico|New Zealand|Poland|Puerto Rico|Russian Federation 1
United States|Australia|Belgium|Canada|Croatia|Czechia|France|Greece|Hungary|Ireland|Italy|Poland|Portugal|Romania|Russian Federation|Spain|Turkey|United Kingdom 1
United States|Australia|Belgium|Canada|Denmark|France|Hungary|Italy|Netherlands|New Zealand|Norway|Poland|Romania|Russian Federation|Spain|Sweden|United Kingdom 1
United States|Australia|Belgium|Canada|Germany|New Zealand|Sweden|Turkey|United Kingdom 1
United States|Australia|Belgium|China|Czechia|France|Germany|Italy|Netherlands|New Zealand|Poland|Spain|Sweden|Turkey|United Kingdom 1
United States|Australia|Belgium|France|Germany|Italy|Netherlands|Puerto Rico|United Kingdom 1
United States|Australia|Belgium|Hungary|India|Poland|Singapore|Spain|Taiwan|Turkey 1
United States|Australia|Brazil|Canada 1
United States|Australia|Brazil|Canada|Denmark|Finland|France|Germany|Italy|Korea, Republic of|Netherlands|Norway|Russian Federation|Spain|Sweden|Taiwan|United Kingdom 1
United States|Australia|Brazil|Czech Republic|France|Israel|Italy|Poland|Puerto Rico|Russian Federation|Ukraine|United Kingdom 1
United States|Australia|Canada|France|Germany|Korea, Republic of|Spain|United Kingdom 1
United States|Australia|Canada|France|Germany|Poland|United Kingdom 1
United States|Australia|Canada|Italy|Puerto Rico|United Kingdom 1
United States|Australia|Canada|Netherlands|New Zealand|Puerto Rico|Switzerland 1
United States|Australia|Canada|New Zealand|Puerto Rico|Saudi Arabia 1
United States|Australia|Canada|Switzerland 1
United States|Australia|France|Germany|Israel|Korea, Republic of|Spain 1
United States|Australia|France|Germany|Italy|Japan|Korea, Republic of|Netherlands|Singapore|Spain 1
United States|Australia|France|Italy|Spain 1
United States|Australia|Germany|United Kingdom 1
United States|Australia|Israel|Poland|Ukraine 1
United States|Australia|Italy|New Zealand|Spain 1
United States|Australia|New Zealand 1
United States|Austria 1
United States|Austria|Belgium|Canada|Denmark|Finland|France|Germany|Greece|Ireland|Israel|Italy|Netherlands|Norway|Portugal|Puerto Rico|Spain|Sweden|Switzerland|Turkey|United Kingdom 1
United States|Austria|Belgium|Czech Republic|France|Germany|Ireland|Italy|Netherlands|Sweden|United Kingdom 1
United States|Austria|Bulgaria|Canada|Croatia|France|Germany|Greece|Italy|Poland|Portugal|Romania|Russian Federation|Sweden|Ukraine 1
United States|Austria|Canada|France|Germany|Italy|Netherlands 1
United States|Austria|Germany|Italy|Poland|United Kingdom 1
United States|Austria|Germany|Italy|Spain 1
United States|Austria|Germany|Poland|Spain 1
United States|Belgium|Canada|Czechia|Denmark|France|Israel|Netherlands|Poland|Russian Federation|Spain|Sweden|Turkey|United Kingdom 1
United States|Belgium|Canada|Denmark|Finland|France|Germany|Italy|Netherlands|Norway|Spain|United Kingdom 1
United States|Belgium|Canada|France|Germany|Israel|Italy|Poland 1
United States|Belgium|Czech Republic|France|Serbia|United Kingdom 1
United States|Belgium|Czech Republic|Greece|Italy|Poland|Russian Federation|Spain 1
United States|Belgium|France|Germany|Israel|Italy|Netherlands|Spain|Sweden|United Kingdom 1
United States|Belgium|France|Italy|Netherlands|Spain 1
United States|Brazil|Bulgaria|Canada|Germany|Greece|India|Italy|Mexico|Netherlands|Poland|Romania|Russian Federation|Spain|Taiwan|Thailand|Ukraine|United Kingdom 1
United States|Brazil|France|Italy|Korea, Republic of|Netherlands|Russian Federation|United Kingdom 1
United States|Canada|France|Germany|Italy|Spain|Sweden|United Kingdom 1
United States|Canada|France|Germany|Netherlands 1
United States|Canada|Georgia|Moldova, Republic of|Poland|Spain|Ukraine 1
United States|Canada|Germany|Israel|United Kingdom 1
United States|Canada|Germany|Italy|Spain|Sweden|United Kingdom 1
United States|Canada|Israel|Puerto Rico 1
United States|Canada|Netherlands|Puerto Rico|Switzerland 1
United States|Canada|Puerto Rico|South Africa 1
United States|Canada|Puerto Rico|Switzerland 1
United States|Denmark 1
United States|Denmark|France|United Kingdom 1
United States|Denmark|Italy 1
United States|Egypt|India 1
United States|France 1
United States|France|Germany|Italy|Japan|Netherlands|United Kingdom 1
United States|France|Germany|Italy|Spain|United Kingdom 1
United States|France|Germany|Italy|Switzerland|United Kingdom 1
United States|France|Italy|Spain 1
United States|France|Japan|United Kingdom 1
United States|France|Spain|United Kingdom 1
United States|Germany|Israel 1
United States|Germany|Italy|Spain 1
United States|Hungary|Israel|Italy|Spain 1
United States|Israel 1
United States|Israel|Italy|Poland|Russian Federation|Spain|United Kingdom 1
United States|Italy|United Kingdom 1
United States|Japan 1
United States|Poland 1
United States|Puerto Rico 1
United States|Sweden 1
United States|Switzerland 1

Sites per Study

Site_count Study_Count
1 535
2 84
3 49
4 34
5 32
6 35
7 16
8 12
9 13
10 17
11 20
12 15
13 11
14 9
15 9
16 9
17 6
18 9
19 5
20 4
21 4
22 13
23 6
24 6
25 7
26 3
27 4
28 6
29 1
30 4
31 3
32 2
33 9
34 8
35 5
36 3
38 2
39 2
41 1
42 2
43 2
44 2
46 3
48 3
50 4
51 3
52 2
53 1
54 2
55 1
56 1
57 1
58 4
60 1
63 1
64 1
66 1
67 1
69 2
70 1
71 3
72 1
75 2
76 2
78 1
79 1
80 1
81 2
84 1
85 1
86 1
87 2
88 2
91 3
92 1
94 1
97 1
101 3
102 1
103 1
106 2
107 1
108 2
111 1
113 2
115 1
117 2
119 1
122 1
123 2
128 1
130 1
134 1
135 2
139 1
145 1
150 2
153 1
157 1
160 3
161 1
162 1
164 1
165 1
170 1
171 1
173 2
174 1
186 1
188 1
196 1
198 1
199 1
210 1
212 1
215 1
218 1
224 1
225 1
239 1
241 1
244 1
262 3
299 1
364 1
551 1
743 1
796 1
835 1
954 1

Phase

Phase Study_Count
Phase 2 463
Phase 1 271
Phase 1/Phase 2 162
Phase 3 131
N/A 61
Phase 4 31
Phase 2/Phase 3 16
Early Phase 1 10

Number of Arms

Number_of_Arms Count_of_Studies
1 651
2 235
3 60
4 31
5 14
6 7
7 8
8 5
9 2
10 6
11 1
12 1
17 1
NA 123

Number of Updates

Count of Versions Count of Studies
1 37
2 56
3 53
4 51
5 53
6 62
7 54
8 44
9 45
10 39
11 46
12 43
13 39
14 28
15 24
16 23
17 27
18 30
19 15
20 19
21 19
22 18
23 21
24 17
25 14
26 17
27 16
28 13
29 9
30 15
31 7
32 12
33 7
34 6
35 4
36 7
37 2
38 4
39 6
40 4
41 4
42 6
43 2
44 2
45 3
46 3
47 1
48 4
49 2
50 2
51 5
52 5
53 4
55 3
56 2
57 2
58 2
59 1
60 1
61 3
62 3
63 2
64 2
65 3
66 1
67 1
69 1
71 1
72 3
73 1
74 2
75 3
77 1
79 2
80 1
81 2
83 2
84 1
85 3
86 2
87 1
91 2
94 1
96 1
105 1
107 1
109 1
115 1
118 1
121 1
125 2
130 1
136 1
139 1
141 1
148 1
154 1
156 1
157 1
158 1
185 1
189 2
205 2
232 1
240 1
241 1
292 1
304 2
326 1
349 1
376 1
397 1
418 1
428 1
455 1
482 1
510 1
630 1
870 1
883 1

Update History Change Type

Change Type Count_of_Changes Count_of_Studies ratio
Study Status 28763 1108 25.959386
Contacts/Locations 14605 1023 14.276637
Arms 2519 768 3.279948
Interventions 2519 768 3.279948
Eligibility 2311 754 3.064987
Recruitment Status 2264 1004 2.254980
Study Description 2212 674 3.281899
Study Design 2101 848 2.477594
Study Identification 1927 733 2.628922
Outcome Measures 1844 742 2.485175
Sponsor/Collaborators 1376 681 2.020558
Conditions 1252 493 2.539554
None (earliest Version on record) 1145 1145 1.000000
Oversight 1018 642 1.585670
References 711 317 2.242902
More Information 544 177 3.073446
Results 264 264 1.000000
IPDSharing 176 137 1.284671
Baseline Characteristics 105 77 1.363636
Results Submission Events 85 85 1.000000
Documents 70 65 1.076923
Reported Adverse Events 70 61 1.147541
Participant Flow 60 49 1.224490
2020 Outcome Measures 1 1 1.000000
Quality Control Review has not concludedReturned: March 18 1 1 1.000000

Enrollment Metrics by Phase

Measure Early.Phase.1 N.A Phase.1 Phase.1.Phase.2 Phase.2 Phase.2.Phase.3 Phase.3 Phase.4
Min. 4.00 2.0000 2.00000 1.0000 2.00000 10.0000 40.0000 9.0000
1st Qu. 6.25 30.7500 16.00000 30.0000 30.00000 40.5000 211.0000 65.0000
Median 16.50 59.5000 29.00000 42.0000 50.00000 88.0000 400.0000 100.0000
Mean 46.90 191.6207 41.94052 68.6478 70.15367 194.5625 849.7984 277.4839
3rd Qu. 33.75 103.5000 48.00000 79.5000 86.00000 137.5000 775.0000 347.5000
Max. 312.00 4000.0000 746.00000 942.0000 470.00000 1000.0000 9350.0000 2600.0000

Trial Group Type

group_type Group_Count
Experimental 1456
Active Comparator 188
NA 123
No Intervention 42
Other 42
Placebo Comparator 22
Sham Comparator 1

Intervention Model

intervention_model Study_Count
Single Group Assignment 768
Parallel Assignment 278
NA 50
Sequential Assignment 28
Crossover Assignment 14
Factorial Assignment 7

Primary Purpose

primary_purpose Study_Count
Treatment 1074
Supportive Care 35
Prevention 17
Basic Science 9
Other 4
NA 4
Diagnostic 1
Health Services Research 1

Observational Studies

Studies by Country

Country Study_Count
United States 45
France 11
NA 9
Denmark 8
Italy 7
Korea, Republic of 5
Greece 4
Israel 4
Russian Federation 4
Canada 3
Spain 3
Argentina 2
India 2
Ireland|United Kingdom 2
Mexico 2
Sweden 2
Austria|Germany|Italy 1
Austria|Germany|Switzerland 1
Belgium 1
Belgium|France|Portugal 1
China 1
Czech Republic|France|Germany|Italy|Poland|Russian Federation|Spain|United Kingdom 1
Czechia 1
Denmark|Finland|Iceland|Lithuania|Norway|Sweden 1
Denmark|Finland|Iceland|Norway|Sweden 1
Egypt 1
Finland 1
Germany 1
Guatemala 1
Hungary 1
Indonesia 1
Italy|Switzerland 1
Japan 1
Serbia 1
Switzerland 1
United Kingdom 1
United States|Australia|Canada 1
United States|Australia|Canada|Ireland|New Zealand|Puerto Rico|Switzerland 1
United States|Australia|Canada|New Zealand 1
United States|Australia|Canada|New Zealand|Puerto Rico|Switzerland 1
United States|Australia|Canada|Puerto Rico|Switzerland 1
United States|Canada 1
United States|Czech Republic|France|Germany|Italy|Poland|Spain|United Kingdom 1
United States|Netherlands 1

Sites per Study

Site_count Study_Count
1 80
2 6
3 6
4 2
5 5
6 1
8 1
9 2
10 2
11 1
13 2
14 2
15 2
16 1
17 2
18 1
19 2
21 1
25 1
31 1
33 1
34 1
35 1
39 1
41 2
47 1
51 1
55 1
59 1
66 1
71 1
84 1
112 1
135 1
137 1
165 1
183 1
200 1
244 1

Number of Updates

Count of Versions Count of Studies
1 14
2 19
3 17
4 12
5 12
6 6
7 4
8 2
9 7
10 6
11 4
13 2
14 4
15 2
17 2
20 1
22 1
23 1
25 1
27 2
30 1
45 1
47 1
66 1
71 1
73 1
78 2
83 1
84 1
118 1
122 1
124 1
126 1
164 1
185 1
239 1
297 1
341 1
364 1
391 1
460 1

Update History Change Type

Change Type Count_of_Changes Count_of_Studies ratio
Study Status 4190 127 32.992126
Contacts/Locations 2406 102 23.588235
Study Description 199 50 3.980000
Recruitment Status 197 104 1.894231
Study Design 197 90 2.188889
None (earliest Version on record) 141 141 1.000000
Eligibility 132 64 2.062500
Outcome Measures 103 62 1.661290
Study Identification 101 62 1.629032
Groups 96 39 2.461539
Interventions 96 39 2.461539
Conditions 85 41 2.073171
Sponsor/Collaborators 81 62 1.306452
Oversight 69 50 1.380000
References 46 21 2.190476
IPDSharing 11 9 1.222222
Results 3 3 1.000000
Results Submission Events 3 3 1.000000
Documents 1 1 1.000000
More Information 1 1 1.000000

Enrollment Metrics

Measure Observational
Min 1.0000
1st Qu 63.7500
Median 155.5000
Mean 724.6857
3rd Qu 438.5000
Max 17463.0000

Observation Model

observational_model Study_Count
Cohort 80
Case-Only 26
Other 10
NA 8
Case-Control 7
Case Control 5
Family-Based 3
Case-Crossover 1
Defined Population, Natural History 1

Time Perspective

time_perspective Study_Count
Prospective 82
Retrospective 36
Cross-Sectional 9
Other 8
NA 4
Cross-Sectional, Retrospective 1
Longitudinal, Prospective 1

Registries

Studies by Country

Country Study_Count
United States 5
France 2
NA 2
China 1
Czechia 1
Germany 1
Indonesia 1
Italy 1
Sweden 1
Turkey 1

Sites per Study

Site_count Study_Count
1 10
2 3
10 1
51 1
192 1

Number of Updates

Count of Versions Count of Studies
1 5
2 1
3 2
4 2
5 2
6 1
11 1
13 1
23 1

Update History Change Type

Change Type Count_of_Changes Count_of_Studies ratio
Study Status 68 11 6.181818
Contacts/Locations 27 8 3.375000
None (earliest Version on record) 16 16 1.000000
Study Design 11 7 1.571429
Recruitment Status 9 7 1.285714
References 6 1 6.000000
Eligibility 5 3 1.666667
Outcome Measures 5 2 2.500000
Study Identification 5 4 1.250000
Sponsor/Collaborators 4 3 1.333333
Study Description 4 3 1.333333
Conditions 3 2 1.500000
Groups 2 2 1.000000
Interventions 2 2 1.000000
Oversight 2 2 1.000000
IPDSharing 1 1 1.000000

Enrollment Metrics

Measure Registries
Min 24.000
1st Qu 199.500
Median 510.500
Mean 2177.125
3rd Qu 2448.750
Max 10000.000

Registry Model

observational_model Study_Count
Cohort 11
Other 4
Case-Only 1

Time Perspective

time_perspective Study_Count
Prospective 12
Cross-Sectional 2
Other 2

Follow-up

target_duration Study_Count
10 Years 5
2 Years 3
1 Year 2
1 Day 1
12 Months 1
15 Years 1
20 Years 1
3 Years 1
5 Years 1